Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / m68k / kernel / bootinfo_proc.c

diff --git a/kernel/arch/m68k/kernel/bootinfo_proc.c b/kernel/arch/m68k/kernel/bootinfo_proc.c
new file mode 100644 (file)
index 0000000..7ee853e
--- /dev/null
+++ b/kernel/arch/m68k/kernel/bootinfo_proc.c
@@ -0,0 +1,80 @@
+/*
+ * Based on arch/arm/kernel/atags_proc.c
+ */
+
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/printk.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <asm/bootinfo.h>
+#include <asm/byteorder.h>
+
+
+static char bootinfo_tmp[1536] __initdata;
+
+static void *bootinfo_copy;
+static size_t bootinfo_size;
+
+static ssize_t bootinfo_read(struct file *file, char __user *buf,
+                         size_t count, loff_t *ppos)
+{
+       return simple_read_from_buffer(buf, count, ppos, bootinfo_copy,
+                                      bootinfo_size);
+}
+
+static const struct file_operations bootinfo_fops = {
+       .read = bootinfo_read,
+       .llseek = default_llseek,
+};
+
+void __init save_bootinfo(const struct bi_record *bi)
+{
+       const void *start = bi;
+       size_t size = sizeof(bi->tag);
+
+       while (be16_to_cpu(bi->tag) != BI_LAST) {
+               uint16_t n = be16_to_cpu(bi->size);
+               size += n;
+               bi = (struct bi_record *)((unsigned long)bi + n);
+       }
+
+       if (size > sizeof(bootinfo_tmp)) {
+               pr_err("Cannot save %zu bytes of bootinfo\n", size);
+               return;
+       }
+
+       pr_info("Saving %zu bytes of bootinfo\n", size);
+       memcpy(bootinfo_tmp, start, size);
+       bootinfo_size = size;
+}
+
+static int __init init_bootinfo_procfs(void)
+{
+       /*
+        * This cannot go into save_bootinfo() because kmalloc and proc don't
+        * work yet when it is called.
+        */
+       struct proc_dir_entry *pde;
+
+       if (!bootinfo_size)
+               return -EINVAL;
+
+       bootinfo_copy = kmalloc(bootinfo_size, GFP_KERNEL);
+       if (!bootinfo_copy)
+               return -ENOMEM;
+
+       memcpy(bootinfo_copy, bootinfo_tmp, bootinfo_size);
+
+       pde = proc_create_data("bootinfo", 0400, NULL, &bootinfo_fops, NULL);
+       if (!pde) {
+               kfree(bootinfo_copy);
+               return -ENOMEM;
+       }
+
+       return 0;
+}
+
+arch_initcall(init_bootinfo_procfs);